Silk fibroin protein as dual mode picric acid sensor and UV photoactive material
2021
Hazarika, Indranee | Goswami, Kangkan Jyoti | Hussain, Amreen Ara | Kalita, Tapash | Sarma, Neelotpal Sen | Gogoi, Bedanta
Silk fibroin (SF) protein was reported as a versatile platform for selective detection of picric acid (PA) as well as for UV photodetection. SF in aqueous media undergoes about 74% fluorescence quenching in the presence of 24 nM concentration of PA in aqueous media with a limit of detection of about 0.203 nM. The quenching was found to due to the combined effect of Förster resonance energy transfer, hydrogen-bonding, and electrostatic interaction. The method is also applicable for real environmental samples. Electrical measurement-based sensing of PA was also performed by fabricating flexible sensor devices from SF and polyvinyl alcohol on polyethylene terephthalate substrates. The sensors show about twofold enhancement in current conduction and about 33% higher ionic conduction in the presence of the analyte. Interestingly, the combination of SF and PA acts as a photoactive material for UV light and generates about 7.15 µA photocurrent under 360 nm light-emitting diodes. The devices exhibit excellent stability in repetitive bending of the devices and also air-stability at varying relative humidity conditions (40–80%). Additionally, an electronic circuit was designed for precise electrical parameters required during optoelectronic measurements. Therefore, it can be stated that, SF can be used as a versatile platform for dual mode PA sensor as well as UV photodetector.
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